package com.sdgakj.service.account;

import com.google.common.base.Objects;
import com.sdgakj.entity.Role;
import com.sdgakj.entity.RolePermission;
import com.sdgakj.entity.User;
import com.sdgakj.utils.redissession.session.CachingShiroSessionDao;
import com.sdgakj.utils.redissession.session.ShiroSession;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.ByteSource;
import org.springframework.web.util.HtmlUtils;
import org.springside.modules.utils.Encodes;

import javax.annotation.PostConstruct;
import java.io.Serializable;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ShiroDbRealm extends AuthorizingRealm {

	protected AccountService accountService;
    
    protected CachingShiroSessionDao sessionDao;
	/**
	 * 认 证 回调函数,登录时调用.
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) throws AuthenticationException {
		ShiroToken token = (ShiroToken) authcToken;
//		User user = accountService.findAdminByLoginName(token.getUsername());
		String username =HtmlUtils.htmlEscapeHex(token.getUsername());  //将前台输入的特殊的文本进行转义
		// 录入人员也可用
		User user = accountService.findAdminByLoginName(username);
        Subject subject = SecurityUtils.getSubject();
        Serializable sessionId = subject.getSession().getId();
        ShiroSession session = (ShiroSession) sessionDao.doReadSessionWithoutExpire(sessionId);
        session.setAttribute("userId", user.getId());
        session.setAttribute("loginName", user.getLoginName());
        sessionDao.update(session);
		if (user != null) {
			if(user.getPassword().equals(accountService.getEntryptPassword(token.getPswd(), user.getSalt()))){				
				byte[] salt = Encodes.decodeHex(user.getSalt());
				return new SimpleAuthenticationInfo(new ShiroUser(user.getId(), HtmlUtils.htmlUnescape(user.getLoginName()), user.getName(),user.getType()),
						user.getPassword(), ByteSource.Util.bytes(salt), getName());
//			return new SimpleAuthenticationInfo(user.getLoginName(),user.getPassword(),user.getName());
			}else{
				throw new AccountException("帐号或密码不正确！");
			}
		} else {
			return null;
		}
	}
    
	/**
	 * 授权查询回调函数,
     * 进行鉴权但缓存中无用户的授权信息时调用.
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
		ShiroUser shiroUser = (ShiroUser) principals.getPrimaryPrincipal();
//		User user = accountService.findAdminByLoginName(shiroUser.loginName);
		// 录入人员也可用
		User user = accountService.findAdminNotUser(shiroUser.loginName);
		SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
		// ======新添加的权限控制
		Set<String> permissions =new HashSet<String>();
		Role role=user.getRole();
		if(null !=role){			
			List<RolePermission> rpList =role.getPermissionlist();
			for(RolePermission rp :rpList){
				permissions.add(rp.getPermission().getPermissionname());
			}
			info.addRole(user.getRole().getRolename()); //防止没有roleid而报错
		}
		//======================
		info.addStringPermissions(permissions);
		return info;
	}

	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
	@PostConstruct
	public void initCredentialsMatcher() {
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(AccountService.HASH_ALGORITHM);
		matcher.setHashIterations(AccountService.HASH_INTERATIONS);

		setCredentialsMatcher(matcher);
	}

	public void setAccountService(AccountService accountService) {
		this.accountService = accountService;
	}

    public void setSessionDao(CachingShiroSessionDao sessionDao)
    {
        this.sessionDao = sessionDao;
    }
    
    /**
     * 自定义Authentication对象，使得Subject除了携带用户的登录名外还可以携带更多信息.
     */
	public static class ShiroUser implements Serializable {
		private static final long serialVersionUID = -1373760761780840081L;
		public Long id;
		public String loginName;
		public String name;
		public String roles;

		public ShiroUser(Long id, String loginName, String name,String roles) {
			this.id = id;
			this.loginName = loginName;
			this.name = name;
			this.roles =roles;
		}

		public String getName() {
			return name;
		}

		/**
		 * 本函数输出将作为默认的<shiro:principal/>输出.
		 */
		@Override
		public String toString() {
			return loginName;
		}

		/**
		 * 重载hashCode,只计算loginName;
		 */
		@Override
		public int hashCode() {
			return Objects.hashCode(loginName);
		}

		/**
		 * 重载equals,只计算loginName;
		 */
		@Override
		public boolean equals(Object obj) {
			if (this == obj) {
				return true;
			}
			if (obj == null) {
				return false;
			}
			if (getClass() != obj.getClass()) {
				return false;
			}
			ShiroUser other = (ShiroUser) obj;
			if (loginName == null) {
				if (other.loginName != null) {
					return false;
				}
			} else if (!loginName.equals(other.loginName)) {
				return false;
			}
			return true;
		}
	}
}
